/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraGraph.h
Gets the current base id associated with the output node traversal specified by InUsage and InUsageId. If the usage is not found, an invalid guid is returned.
[FGuid](API\Runtime\Core\Misc\FGuid) GetBaseId ( [ENiagaraScriptUsage](API\Plugins\Niagara\ENiagaraScriptUsage) InUsage, const [FGuid](API\Runtime\Core\Misc\FGuid) & InUsageId ) const